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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> Engine Control System Self-Diagnostics - 3.8L >> Diagnostic Tests >> DTC P1516: Commanded & Actual Throttle Position Malfunction >> Diagnostic Procedures

Diagnostic Procedures

  1. If powertrain diagnostic system check was performed, go to next step. If powertrain diagnostic system check was not performed, go to POWERTRAIN DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS. After performing powertrain diagnostic system check, go to next step.
  2. Using scan tool, recheck DTCs. If DTC P1120, P1220 or P1221 is set, diagnose affected DTCs. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If DTC P1120, P1220 or P1221 is not set, go to next step.
  3. Turn ignition off for 15 seconds. Turn ignition on, with engine off. Using scan tool, observe TP sensor 1 and 2 angle parameter. Slowly depress accelerator pedal to Wide Open Throttle (WOT) position and then slowly return pedal to closed throttle position. If TP sensor 1 and 2 angle increase to about 100 percent as pedal is depressed and decrease as pedal is released, see DIAGNOSTIC AIDS . If TP sensor 1 and 2 angle does not increase to about 100 percent as pedal is depressed and does not decrease as pedal is released, go to next step.
  4. Turn ignition off. Disconnect TAC connector. Turn ignition on, with engine off. Using a DVOM, check voltage between TAC connector terminals "D" (Brown wire) and "E" (Yellow wire). If voltage reading is 7.5-8.5 volts, go to step  15. If voltage reading is not 7.5-8.5 volts, go to next step.
  5. Check voltage between a known-good ground and TAC connector terminals "D" (Brown wire) and "E" (Yellow wire). If any voltage present on each circuit, go to step  9. If no voltage is present on each circuit, go to next step.
  6. Check for open in Brown and Yellow wires between TAC and TAC module. Repair as necessary. After repairs, go to step  10. If circuits are okay, go to next step.
  7. Check for short to ground in Brown and Yellow wires between TAC and TAC module. Repair as necessary. After repairs, go to step  11. If circuits are okay, go to next step.
  8. Check continuity between each throttle actuator circuits and all other circuits in TAC module connector. If continuity exists, go to step  12. If continuity does not exist, go to step  13.
  9. Check for short to voltage on affected throttle actuator circuit. Repair as necessary. After repairs, go to step  17. If circuits are okay, go to step  14.
  10. Repair open or high resistance on affected throttle actuator circuit. After repairs, go to step  17.
  11. Repair short to ground on affected throttle actuator circuit. After repairs, go to step  17.
  12. Repair circuits that are shorted together. After repairs, go to step  17.
  13. Check for poor connections at TAC module. Repair as necessary. After repairs, go to step  17. If connections are okay, go to next step.
  14. Replace TAC module. After replacing module, go to step  17.
  15. Check for poor connections at TAC. Repair as necessary. After repairs, go to step  17. If connections are okay, go to next step.
  16. Replace throttle body. After replacing throttle body, go to next step.
  17. Using scan tool, clear DTCs. Turn ignition off for at least 30 seconds. Start engine and allow it to reach normal operating temperature. Operate vehicle within conditions for setting this DTC. If scan tool indicates that this test ran and passed, go to next step. If scan tool does not indicate that this test ran and passed, go to step  2.
  18. Using scan tool, select CAPTURE INFO, REVIEW INFO function. If any undiagnosed DTCs are displayed, go to applicable DTC test. See DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no undiagnosed DTCs are displayed, system is okay.
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